Improvement in blackboard-erasers



W.S.READ.

Black Board-Erasers.

Patented Feb. 4,1873.

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/vsls PRaasss) UNITED STATES PATENT OFFICE.

WINFIELD S. READ, OF OAKLAND, CALIFORNIA.

IMPROVEMENT IN BLACKBOARD-ERASERS.

Specification forming part of Letters Patent No. 135.1187, dated;February 4, 1873.

To all whom it may concern:

of the eraser with a part broken away to show the construction.

Similar letters of reference indicate corresponding parts.

A is a wooden block or the back of the eraser, of suitable size, usuallyabout three inches wide and eight inches long, with its side edgesgrooved to afford a hold for the hand, as represented in the drawing. Bis a wadding; and U represents a carpeting over the wadding,

the wadding and carpeting being equal in size to the side of the block.Over these layers I place my corduroy or ribbed covering D, which is ofsufficient size to lap over the inclosed soft layers onto the wood A, soas to be confined to the wood by means of a strip of leather, E, andnails F, as seen in the drawing.

The corduroy covering D is so placed that the ribs thereof runlongitudinally, as repre sented 5 but" I do not confine myself to thatparticular arrangement, as the ribs may run transversely or diagonally,if desired; but the eraser would be rendered less useful thereby.

The advantages of this corduroy or ribbed covering is, the chalk-dustwill be detached from the blackboard by the ribs and will find alodgment in the grooves between the ribs, from whence it readily dropsinto the chalkbox below. The chalk-dust is not compressed and groundinto the surface, as in the ordinary eraser, but the ribbed wearingsurface is kept clean while it perfectly wipes and leaves `a cleansurface on the board.

I do not confine myself to the particular goods known as corduroy, asother ribbed goods maybe employed.

Having thus described my invention, Iclaim as new and desire to secureby Letters Patent- 1. A blackboarderaser having a surface composed ofribs and grooves, substantially as and for the purposes described.

2. An eraser having a face covered with corduroy or similar. materialover a soft cushion of wadding and carpeting, or similar material,substantially as shown and described.

WINFIELD S. READ.

4 Witnesses: l

S. F. GILeEEsT, v WM. M. GILcREsT.

